Unity of Command Forums

Sorry for what is sure to be a silly question but I've done the tutorials and looked at the manual and cannot for the life of me see how to move supply depots.

I know how to make new ones, add and subtract trucks, but how to make them move is a mystery.

I'm sure this is rather obvious to most but I simply cannot figure out to move the supply depots.

I read over the manual and can't find it there either. So what am I missing? Apologies in advance for such a silly question, but right now I'm really stuck!